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- W2023232261 abstract "Measurements of 234 Th/ 238 U disequilibria were made on an approximately bimonthly basis over the course of a year in nearshore (10–40 m deep) and offshore (160 m deep) surface waters of the southern basin of Lake Michigan (18,100 km 2 ). The mean activity of 238 U in Lake Michigan measured 230 ± 20 dpm m −3 , approximately 1 order of magnitude lower than what is typically found in marine systems. Measured median activities of dissolved (<0.45 μm) and excess particle‐bound 234 Th were 8.0 and 60.6 dpm m −3 , respectively. Using a simple one‐dimensional model, median residence times for dissolved and particle‐bound 234 Th were ∼1 and ∼14 days, respectively. 234 Th‐based particle settling velocities had a median value of 0.4 m d −1 (range: ∼0.0–1.4 m d −1 ), and instantaneous 234 Th‐based estimates of the net vertical mass flux had a median value of 0.4 g m −2 d −1 (range: ∼0.0–5.2 g m −2 d −1 ). Average particle settling velocities were generally constant over time and increased only slightly in the shallowest (10 m) sampling stations. Calculated mass fluxes showed a strong correlation with temporal and spatial changes in the concentration of total suspended matter, which, in the nearshore area, closely followed seasonal variations in wind‐induced wave height. Using a simple two‐box model, the 234 Th‐based cross‐margin mass export rate for the entire southern basin of Lake Michigan was equal to 1.35 × 10 9 kg yr −1 , which is in excellent agreement with a 210 Pb − 137 Cs based, basin‐wide mass sedimentation rate of 1.28 × 10 9 kg yr −1 ." @default.
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- W2023232261 date "2004-09-11" @default.
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- W2023232261 title "Seasonal and spatial dynamics of<sup>234</sup>Th/<sup>238</sup>U disequilibria in southern Lake Michigan" @default.
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- W2023232261 doi "https://doi.org/10.1029/2003jc002204" @default.
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